Carburetor choke



Oct. 16, 1951 NEUSER 2,571,602

CARBURETOR CHOKE Filed July 16, 1948 INVENTOR. Ea Wz'w F/VeaserATTORNEYS Patented Oct. 16, 1951 UNITED STATES PATENT OFFICE 2,571,602CARBURETOR CHOKE Edwin P. Neuser, Francis Creek, Wis. Application July16, 1948, Serial No. 39,142

1 Claim. 1

This invention relates to an improved choking device for internalcombustion engine carburetors of the automatic type, the primary objectof the invention being to provide manual means operable from the drivingcompartment of an automobile or the like whereby an under-choking orover-choking automatic choke may be adjusted for existing operatingconditions without having to resort to mechanical adjustment and/ ordisassembly of the automatic choke mechanism.

Other important objects and advantageous features of the invention willbe apparent from the following description and accompanying drawings,wherein, merely for purposes of illustration herein, a specificembodiment of the invention is set forth in detail.

In the drawings Figure 1 is a fragmentary, contracted side elevation,showing an arrangement in accordance with the present invention.

Figure 2 is a fragmentary end elevation, looking from left to right inFigure 1.

Figure 3 is a fragmentary top. plan view, partly in section to showstructural details, and

Figure 4 is an inner side elevation of the climatic housing of aconventional automatic choke, partly broken away to show thethermostatic element therein and the butterfly valve shaft operatedthereby.

Referring in detail to the drawings, the numeral 5 generally designatesa conventional automobile engine carburetor of the Carter type, having abutterfly choke valve 6 on a shaft 1 extending laterally through thecarburetor into the climatic housing 8 mounted on the side of thecarburetor and enclosing a helical thermostatic coil 9 having its outerend anchored to the housing 8 and its inner end inserted in a slot Illprovided in the shaft 1, whereby the shaft 1 and hence the choke valve 6are automatically rotatably positioned in accordance with the prevailingatmospheric and engine temperatures.

Ordinarily the action of the automatic choke mechanism is correctly setat the factory, but Wear and deterioration due to heat and other factorsproduce maladjustment of the mechanism in time, and necessary adjustmentthereof for proper operation of the carburetor, and hence of the engineassociated therewith, is usually obtained by removing and/or adjustingthe housing mounting screws ll, I2 and I3.

However, in accordance with the present invention, adjustment of theaction of the automatic choke mechanism, either to compensate 2 formaladjustment thereof or to accommodate special operating conditions, isobtainable at the will of the driver of an automobile or the like,without disturbing the screws II, I! and I3 or the housing 8.

This is done by providing the butterfly choke valve shaft 1 with athreaded prolongation l4 extending through the outer wall l5 of thehousing 8, as best shown in Figure 3. 0n the threaded prolongation I4 isplaced a washer Hi to engage the outer surface of the wall [5, followedby an inner locknut ll, an apertured radial lever arm IS, a lock washerl9, and an outer lock nut 20, these parts being adjusted on the shaftprolongation so that the arm I8 is fixed in correct angular position andno binding contact with the housing 8 obtains.

The radially outward end of the arm I 8 is traversed by the pivot 2! ofan ordinary choke rod holder 22, having a set screw 23 for holding inthe bore 24 thereof the choke rod 25. The choke rod 25 is extendedrearwardly from the carburetor 5 through a choke rod fitting '26 on theinstrument panel 2'! and is provided on its rear end with a button orknob 28.

A stop for the lever arm I8 is provided in the form of a bolt 29extending through the wall iii of the housing 3 into the path of the arm[8, and so positioned that the lever Hi cannot be operated by the chokerod 25 in a reverse direction sufiiciently to damage the thermostaticelement 9 or move the choke valve beyond closed position.

In operation, if the automatic operation of the automatic chokemechanism is such that underchoking of the carburetor takes place, thebutton 28 is pushed forwardly, so as to further close the choke valve 6and thereby adjust the mechanism to provide desirable additionalchoking. In the case of over-choking produced by the automatic chokemechanism, the button 28 is pulled rearwardly to further open the chokevalve 6 to the degree desired. The button 28 is left in the positionproducing smooth operation of the engine when warmed up.

What is claimed is:

The combination with a carburetor including a butterfly valve carryingshaft having one end projecting therefrom, a housing surrounding andpositioned inwardly of the projecting end of said shaft and secured tothe carburetor, a helical thermostatic coil fixedly anchored within saidhousing and secured to said shaft, said shaft being threaded inwardlyfrom its projecting end and terminating at a point adjacent said hous- 3ing to form a threaded portion, a choke valve control mechanismoperatively connected to the threaded portion of said shaft, saidmechanism comprising a first lock nut positioned on the threaded portionof said shaft and in threaded engagement therewith, a lever armpositioned in side by side spaced relation with respect to said housingand having one end circumposed about the threaded portion of said shaftand abutting said lock nut, a second lock nut positioned on the threadedportion of said shaft abutting said one end of said lever arm and inthreaded engagement with the threaded portion of said shaft, a choke rodarranged in end to end relation with respect to the other end of saidlever arm and having one end pivotally connected to the other end ofsaid lever arm, and hand actuable means on the other end of said chokerod for actuating the latter.

EDWIN P. NEUSER.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 1,821,014 Heitger Sept. 1, 19312,004,242 Heitger June 11, 1935 2,017,890 Bracke Oct. 22, 1935 2,109,113Hunt Feb. 22, 1938 2,278,871 Folberth et a1 Apr. 7, 1942 2,381,751 HuntAug. 7, 1945 2,423,059 Winkler June 24, 1947

